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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网

...已下载好的工程源码,关注页面底部公众号(或搜索“fun123cn”关注),回复“源码”即可免费下载。 代码编写 采用自己较为熟悉的java开发环境就行,这里推荐使用VSCode,拓展目录在 appinventor-sources/appinventor/components ,测试代...
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How do I convert a string to a number in PHP?

... honzasp is right, for example in JavaScript typeof('123'+0) gives 'string', because '123'+0 gives '1230'. – Oriol Feb 24 '13 at 21:01 5 ...
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Can I replace groups in Java regex?

...s) { // replace with "%" what was matched by group 1 // input: aaa123ccc // output: %123ccc System.out.println(replaceGroup("([a-z]+)([0-9]+)([a-z]+)", "aaa123ccc", 1, "%")); // replace with "!!!" what was matched the 4th time by the group 2 // input: a1b2c3d4e5 // outp...
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ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage? [closed]

...t;"; exit("done"); ?> Sample result: [array] => "id" => 123, "title" => "My post title.", "content" => "My <p>post</p> content.", ... [ and other fields ] Sphinx query time: 0.001 sec. Sphinx query time (1k concurrent): => 0.346 sec. (average) ...
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In JavaScript, does it make a difference if I call a function with parentheses?

...not using ()'s Lets take this function for example: function foo(){ return 123; } if you log "foo" - without () console.log(foo); ---outout------ function foo(){ return 123; } Using no () means to fetch the function itself. You would do this if you want it to be passed along as a callback. if ...
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What is the benefit of zerofill in MySQL?

... y INT(8) NOT NULL); INSERT INTO yourtable (x,y) VALUES (1, 1), (12, 12), (123, 123), (123456789, 123456789); SELECT x, y FROM yourtable; Result: x y 00000001 1 00000012 12 00000123 123 123456789 123456789 ...
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Why is a combiner needed for reduce method that converts type in java 8

... answered Sep 4 '15 at 7:39 quiz123quiz123 3655 bronze badges ...
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Best way to pretty print a hash

...\2:"). # "foo": 1 -> foo: 1 gsub(/(^\s*)(".*?"):/, "\\1\\2 =>") # "123": 1 -> "123" => 1 { a: 1, "2" => 3, "3" => nil } share | improve this answer | ...
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Why is isNaN(null) == false in JS?

... Won't work if myInt="123d". parseInt converts "123d" to 123, which then fails the isNaN test. – divesh premdeep Feb 18 '15 at 13:34 ...
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How would you make a comma-separated string from a list of strings?

...gIO import StringIO import csv l = ['list','of','["""crazy"quotes"and\'',123,'other things'] line = StringIO.StringIO() writer = csv.writer(line) writer.writerow(l) csvcontent = line.getvalue() # 'list,of,"[""""""crazy""quotes""and\'",123,other things\r\n' ...